Home : Tune Toys : Expresso
Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

Transformations:
 Seed: Randomize seed: Generations: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Phrase for X: Basic 1 - c,e,gBasic 2 - c,g,e,b-Basic 3 - c,gBasic 4 - cBasic 5 - co3,co4,co3,co2Chord 1 - c e gChord 2 - c e- gChord 3 - c e- g b-Chord 4 - c f gFile 1 - bachinv1.midFile 2 - bachinv2.midFile 3 - bachinv3.midFile 4 - bachinv4.midFile 5 - bachinv5.midFile 6 - bachinv6.midFile 7 - bachinv7.midFile 8 - bachinv8.mid # of Tracks: 1234 Randomize patches: noyes Results may not appear for a few seconds.Be patient!
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 After 15 generations the expression "X" became this: echo((((transpose(transpose((X+X) ,-7) ,-7) +transpose(transpose((transpose(transpose(X,-7) ,-7) +(X+transpose(X,7) ) ) ,4) ,12) ) +transpose(((transpose(echo((transpose(transpose(X,-5) ,4) |((X|X) |(X+transpose(X,7) ) ) ) ,4,6) ,4) +transpose((echo(transpose(step(transpose(X,-5) ,12) ,-5) ,4,6) +transpose(transpose(transpose(((X|X) +(echo(X,4,6) +echo(echo(X,4,6) ,4,6) ) ) ,4) ,-5) ,7) ) ,7) ) +(((((((X+transpose(X,-7) ) +transpose((X+transpose((X|X) ,12) ) ,-7) ) +echo((X+transpose(X,12) ) ,4,6) ) +(transpose(transpose(shuffle(X) ,-7) ,4) +transpose((transpose(transpose(transpose(X,4) ,-7) ,4) |transpose(transpose(X,4) ,4) ) ,12) ) ) +transpose(arpeggio(echo((transpose((X+transpose(X,12) ) ,4) |arpeggio(transpose((X+transpose(X,7) ) ,-5) ) ) ,4,6) ) ,12) ) +transpose(transpose(transpose(transpose((((((X+transpose(X,12) ) |(X+transpose(X,7) ) ) +echo(transpose(X,-5) ,4,6) ) +transpose(((X|X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) ,7) ) |((echo(X,4,6) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) ) ,-5) ,4) ,-5) ,4) ) +transpose(arpeggio((((transpose((transpose(transpose(X,4) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,12) ) +((transpose(X,4) +transpose(echo(X,4,6) ,7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) ) |((((((X+X) +(transpose(X,-5) |(X+transpose(X,12) ) ) ) +transpose(transpose(X,4) ,4) ) +transpose((((((X+transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((echo((X|X) ,4,6) +transpose((X+transpose(X,7) ) ,12) ) ,12) ) ,7) ) +transpose(transpose(((((X|X) +transpose((X+X) ,12) ) +(X+transpose(transpose(X,4) ,12) ) ) +transpose(transpose((X+X) ,-5) ,-7) ) ,-7) ,4) ) +transpose(transpose((((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) +transpose(arpeggio(X) ,4) ) +transpose(step(transpose((X+transpose(X,12) ) ,-5) ,12) ,7) ) ,-5) ,7) ) ) ) ,7) ) ) ,7) ) +transpose(transpose(((X+X) |transpose(((X|X) +transpose(shuffle(X) ,7) ) ,-7) ) ,4) ,7) ) ,4,6) random seed used was 18 EXPR = (transpose(transpose(transpose((arpeggio(transpose((step(X,12) |(X+transpose(X,7) ) ) ,-5) ) +transpose(echo(((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,4) ) ,-5) ,-5) ,-5) +transpose((transpose(((transpose(((X+transpose(X,12) ) +step(X,12) ) ,4) +transpose(transpose((shuffle(X) +transpose(X,12) ) ,-5) ,12) ) +(transpose(transpose(echo(shuffle((X|X) ) ,4,6) ,4) ,-7) |transpose((transpose(((X+transpose(X,7) ) |X) ,4) +transpose((transpose((X+transpose(X,7) ) ,-7) +echo(transpose(X,4) ,4,6) ) ,7) ) ,-7) ) ) ,-5) |arpeggio(step(((transpose(transpose((((X+transpose(arpeggio((((X+X) |transpose(X,4) ) |transpose((transpose(X,-7) +shuffle(X) ) ,4) ) ) ,4) ) +transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) +transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +step((X+X) ,12) ) +step((transpose(X,-5) +transpose(transpose(X,4) ,-7) ) ,12) ) ,4) ,12) ) ,-5) ,-7) +transpose(shuffle(step((transpose(((((echo((X|X) ,4,6) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(step(echo(transpose(X,4) ,4,6) ,12) ,7) ) ,-5) +transpose((X+transpose(X,12) ) ,4) ) ,12) ) ,4) ) +transpose(transpose((((echo(transpose(transpose(X,-5) ,-5) ,4,6) +transpose((transpose((X+transpose(X,12) ) ,-5) |transpose(step(X,12) ,-7) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +echo(echo((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,4,6) ) ,4) ,7) ) ,12) ) ) ,12) ) random seed used was 0 EXPR = step((shuffle(((((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(((shuffle(((X+transpose(X,-7) ) +arpeggio(X) ) ) +transpose(((X|X) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose((((X+X) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ,7) ) ,-7) ,4) ) +transpose(((transpose((X+X) ,-7) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,7) ) ,12) ,7) ) ,7) ) |(((arpeggio(transpose(X,4) ) +transpose(X,-7) ) +transpose((X|X) ,7) ) |transpose((transpose((X+X) ,-5) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) ) ) ) +transpose(transpose(transpose(((transpose((transpose((X+transpose(X,7) ) ,-7) |(arpeggio(X) +transpose(X,7) ) ) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) |(transpose(X,-7) +transpose(arpeggio(X) ,12) ) ) ) +transpose(transpose((shuffle((X|(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) ) +step(transpose(transpose(X,4) ,4) ,12) ) ,4) ,7) ) ,-5) ,-5) ,12) ) ,12) random seed used was 0 EXPR = (transpose(transpose(((((((shuffle((step(arpeggio(X) ,12) |(X|X) ) ) +transpose(transpose(transpose(transpose(transpose((X|X) ,-5) ,-7) ,4) ,-5) ,4) ) +transpose((transpose((transpose(echo(X,4,6) ,4) +(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) |arpeggio(((transpose(transpose(X,-5) ,-7) |((X|X) |transpose(X,4) ) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose(X,7) ) ,7) ) ) ) ,7) ) +transpose((((transpose(X,4) +transpose(transpose(X,4) ,7) ) +transpose((X+((X+transpose(X,12) ) |shuffle(X) ) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((transpose(transpose(((shuffle(X) +transpose(((X+transpose(X,12) ) |X) ,4) ) +transpose((X|X) ,7) ) ,-7) ,-5) +(transpose(((X+transpose(X,7) ) +transpose(((X+X) +(X+transpose(X,12) ) ) ,12) ) ,-7) |step(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,12) ) ) ,12) ) +transpose((((shuffle(((transpose(X,-5) |echo(X,4,6) ) +transpose(echo(transpose(X,4) ,4,6) ,-5) ) ) |step(((arpeggio(X) +transpose((transpose(echo(X,4,6) ,-5) +echo(X,4,6) ) ,4) ) +transpose(step((X|X) ,12) ,7) ) ,12) ) +transpose(((arpeggio(X) +transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,4,6) ,7) ) +transpose(step((((X+transpose(echo(X,4,6) ,7) ) +(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) |(transpose((X+X) ,-5) |(X+transpose((X+arpeggio(X) ) ,7) ) ) ) ,12) ,12) ) ,4) ) +transpose(transpose((((((X+transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((echo(X,4,6) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,4) ) +transpose(arpeggio(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) +transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,12) ) ,4) ,7) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,-7) ,-7) +transpose(((echo((transpose(transpose(transpose(X,-7) ,-7) ,-5) +transpose(transpose(transpose(((X|echo(X,4,6) ) +(((step(X,12) |X) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4) ,7) ) ,4,6) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(((X+X) +transpose((step(X,12) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,12) ) ,-5) ) |shuffle(echo((((X+X) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose((echo((X+transpose(X,12) ) ,4,6) +transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,7) ) ,4,6) ) ) ,-7) ,-7) ,7) ) +transpose((echo(step(transpose(((((transpose(X,4) +transpose(X,7) ) |((((X+transpose(X,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +step(X,12) ) ,7) ) ) +transpose((transpose(shuffle(X) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose(echo((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) ,-7) ,12) ,4,6) |arpeggio(transpose(arpeggio((echo((transpose(X,4) +transpose(X,-5) ) ,4,6) +transpose((X|(X+X) ) ,12) ) ) ,-5) ) ) ,7) ) ,12) ) random seed used was 0

The algorithm for Expresso is written in KeyKit, and here's the source code.